which kind of systems implement the following constructs.
http://www.amazon.com/Lorentzian-Wormholes-Einstein-Computational-Mathematical/dp/1563966530
http://www.math.washington.edu/~gunther/publications/Papers/wormholeprlfinal.pdf
http://arxiv.org/abs/gr-qc/0511086
http://arxiv.org/abs/0812.5107
http://arxiv.org/find/all/1/all:+AND+traversable+wormhole/0/1/0/all/0/1
http://arxiv.org/find/all/1/all:+AND+warp+drive/0/1/0/all/0/1
http://scholar.google.ca/scholar?q=traversable+wormhole&hl=en
http://scholar.google.ca/scholar?hl=en&q=warp+drive
http://scholar.google.ca/scholar?hl=en&q=spinor+wormhole&btnG=Search
http://scholar.google.ca/scholar?hl=en&q=spinor+traversable+wormhole
http://scholar.google.ca/scholar?hl=en&q=connected+spacetime
http://scholar.google.ca/scholar?start=10&q=curved+spacetime&hl=en
http://scholar.google.ca/scholar?q=spinor+connected+spacetime&hl=en
http://scholar.google.ca/scholar?hl=en&q=spinor+curved+spacetime
http://scholar.google.ca/scholar?hl=en&q=spinor+warp+drive